One thing my Big Horn lacked was a backup camera. Truth be told, none of my previous trucks had one, but my last car did, and once you get used to one it's kind of a jolt not to have it, especially with a tall rear end. I looked at a few options and in reality the OEM kit turned out to be very close to getting an aftermarket setup price wise, so I ordered the kit from my local dealer and had them install it. Thus I was able to get the lines in sync with the steering which a lot of the non-oem kits won't do, for basically the same price.
Once installed, the image was really small. I had the RA2 audio, and had been thinking about upgrading it - but as soon as I saw the small backup camera image, it pushed me over the edge to upgrade. The RA2 is a wide sceen and the image is square, kinda like watching SD tv on HDTV with the black bars
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EDIT - Longer writeup on the install and impressions here
https://www.ramforum.com/threads/ra2-to-ra4-8-4an-upgrade-kit.124804/
So I grabbed the 8.4 upgrade kit from infotainment.com. It was fairly expensive to be sure, but they do offer a mil discount, and with trading in my ra2 and also not having to purchase a window hang GPS, it offset the price quite a bit. I'll do a longer write-up on the install, but short version is I am very happy with the new setup. You can for sure get a better/nicer audio setup for the price by going aftermarket, but I'm not looking to go boom boom, just want a nicer audio experience while keeping all my truck/uconnect/etc functions in place.